The best treatment will depend on the cause. This could be related to chemotherapy, infection, etc. Once her physician determines the cause then a treatment can be identified.
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Any symptoms associated with treatment, if not under control, should be discussed with your doctor. Tests may be required to determine why diarrhea is occurring.

In brief:
Speak with doctor

Any symptoms associated with treatment, if not under control, should be discussed with your doctor. Tests may be required to determine why diarrhea is occurring.
Would you like to video or text chat with me?